Cisco Nexus 5000 Series Manuale utente

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration

Guide

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Fax: 408 527-0883

Text Part Number: OL-20921-01

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relationship between Cisco and any other company. (1110R)

CONTENTS

Preface

Preface vii

Audience vii

Document Organization vii

Document Conventions viii

Related Documentation for Nexus 5000 Series NX-OS Software ix

Obtaining Documentation and Submitting a Service Request x

CHAPTER 1

New and Changed Information 1

CHAPTER 2

Overview 3

CHAPTER 3

Configuring QoS 5

Information About QoS 5

MQC 6

System Classes 7

Default System Classes 7

Policy Types 8

Link-Level Flow Control 10

Priority Flow Control 10

MTU 11

Trust Boundaries 11

Ingress Queuing Policies 12

Ingress Classification Policies 12

Egress Queuing Policies 12

QoS for Multicast Traffic 13

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

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Policy for Fibre Channel Interfaces 13

QoS for Traffic Directed to the CPU 14

QoS Configuration Guidelines and Limitations 14

Configuring System Classes 15

Configuring Class Maps 15

Configuring ACL Classification 16

Configuring CoS Classification 17

Configuring DSCP Classification 18

Configuring IP RTP Classification 19

Configuring Precedence Classification 20

Configuring Protocol Classification 22

Configuring QoS Group Classification 23

Configuring Policy Maps 24

Configuring Type QoS Policies 26

Configuring Type Network QoS Policies 27

Configuring Type Queuing Policies 29

Information About Marking 30

Configuring CoS Marking 30

Attaching the System Service Policy 31

Restoring the Default System Service Policies 32

Configuring the Queue Limit for Fabric Extenders 34

Enabling the Jumbo MTU 35

Verifying the Jumbo MTU 35

Configuring QoS on Interfaces 36

Configuring Untagged CoS 36

Configuring Interface Service Policy 37

Configuring the Queue Limit for a Specified Fabric Extender 38

Configuring No-Drop Buffer Thresholds 40

Configuring the Buffer Threshold for the Cisco Nexus 2148T Fabric Extender 41

Configuring Priority Flow Control and Link-Level Flow Control 42

Configuring Priority Flow Control 43

Configuring Link-Level Flow Control 43

Enabling Virtual Output Queuing Limits for Unicast Traffic on the Cisco Nexus 5548

Switch 44

Verifying QoS Configuration 45

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

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Contents

Example QoS Configurations 51

QoS Example 1 51

QoS Example 2 52

QoS Example 3 54

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

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Contents

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

vi OL-20921-01

Contents

Preface

This preface describes the audience, organization, and conventions of the Cisco Nexus 5000 Series NX-OS

Quality of Service Configuration Guide. It also provides information on how to obtain related documentation.

•Audience, page vii

•Document Organization, page vii

•Document Conventions, page viii

•Related Documentation for Nexus 5000 Series NX-OS Software, page ix

•Obtaining Documentation and Submitting a Service Request, page x

Audience

This preface describes the audience, organization, and conventions of the . It also provides information on

how to obtain related documentation.

Document Organization

This document is organized into the following chapters:

DescriptionChapter

Describes the new and changed information for the new Cisco NX-OS

software releases.

New and Changed Information

Describes the Quality of Service features supported by the Cisco NX-OS

software.

Overview

Describes Quality of Service, guidelines and limitations, and information

about how to configure the Quality of Service feature.

Configuring Quality of Service

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

OL-20921-01 vii

Document Conventions

Command descriptions use the following conventions:

DescriptionConvention

Bold text indicates the commands and keywords that you enter literally

as shown.

bold

Italic text indicates arguments for which the user supplies the values.

Italic

Square brackets enclose an optional element(keyword or argument).[x]

Square brackets enclosing keywords or arguments separated by a vertical

bar indicate an optional choice.

[x | y]

Braces enclosing keywords or arguments separated by a vertical bar

indicate a required choice.

{x | y}

Nested set of square brackets or braces indicate optional or required

choices within optional or required elements. Braces and a vertical bar

within square brackets indicate a required choice within an optional

element.

[x {y | z}]

Indicates a variable for which you supply values, in context where italics

cannot be used.

variable

A nonquoted set of characters. Do not use quotation marks around the

string or the string will include the quotation marks.

string

Screen examples use the following conventions:

DescriptionConvention

Terminal sessions and information the switch displays are in screen font.screen font

Information you must enter is in boldface screen font.boldface screen font

Arguments for which you supply values are in italic screen font.italic screen font

Nonprinting characters, such as passwords, are in angle brackets.< >

Default responses to system prompts are in square brackets.[ ]

An exclamation point (!) or a pound sign (#) at the beginning of a line

of code indicates a comment line.

!, #

This document uses the following conventions:

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

viii OL-20921-01

Preface

Document Conventions

Means reader take note. Notes contain helpful suggestions or references to material not covered in the

manual.

Note

Means reader be careful. In this situation, you might do something that could result in equipment damage

or loss of data.

Caution

Related Documentation for Nexus 5000 Series NX-OS Software

Cisco NX-OS documentation is available at the following URL:

http://www.cisco.com/en/US/products/ps9670/tsd_products_support_series_home.htmll

The documentation set for the Cisco Nexus 5000 Series NX-OS software includes the following documents:

Release Notes

•Cisco Nexus 5000 Series and Cisco Nexus 2000 Series Release Notes

•Cisco Nexus 5000 Series Switch Release Notes

Cisco Nexus 5000 Series NX-OS Configuration Guides

•Cisco Nexus 5000 Series NX-OS Fibre Channel over Ethernet Configuration Guide

•Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide

•Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

•Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide

•Cisco Nexus 5000 Series NX-OS Security Configuration Guide

•Cisco Nexus 5000 Series NX-OS System Management Configuration Guide

•Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

•Cisco Nexus 5000 Series Fabric Manager Configuration Guide, Release 3.4(1a)

Installation and Upgrade Guides

•Cisco Nexus 5000 Series Hardware Installation Guide

•Regulatory Compliance and Safety Information for the Cisco Nexus 5000 Series

Cisco NX-OS Command References

•Cisco Nexus 5000 Series Command Reference

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

OL-20921-01 ix

Preface

Related Documentation for Nexus 5000 Series NX-OS Software

Cisco NX-OS Technical References

•Cisco Nexus 5000 MIBs Reference

Cisco NX-OS Error and System Messages

•Cisco NX-OS System Messages Reference

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information,

see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco

technical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed

and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free

service and Cisco currently supports RSS version 2.0.

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide

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Preface

Obtaining Documentation and Submitting a Service Request

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